Geographical Information (Schedule of Revenue by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 32,591	$ 21,532	$ 62,767	$ 44,022
United States [Member]
Segment Reporting Information [Line Items]
Revenue	25,930	15,369	50,684	29,182
Asia [Member]
Segment Reporting Information [Line Items]
Revenue	4,772	4,638	8,491	10,977
Europe [Member]
Segment Reporting Information [Line Items]
Revenue	1,695	1,371	3,325	3,534
Other [Member]
Segment Reporting Information [Line Items]
Revenue	$ 194	$ 154	$ 267	$ 329